|United States Patent||4,124,773|
|Elkins||November 7, 1978|
This invention relates to an electronic system and a method for storing and distributing audio signals over existing communication lines. The system comprises a compressor for compressing in a predetermined manner the waveform amplitude of an input analog signal, thereby forming a compressed analog signal. The compressed analog signal is then converted into a digital signal by an analog to digital converter. A digital interface subsystem stores and retrieves selected ones of the digital signals for transmission over a communications line. At a remote end of the communications line the digital signal is converted back to its analog compressed signal representation by a digital to analog converter. The compressed analog signal is then expanded in a manner complimentary to the compressor operation, thus reconstructing the analog signal. A selector generator is provided at the remote end of the communications line for generating a command signal over the communications line to command the digital interface subsystem to select the desired one of the stored digital signals.
|Inventors:||Elkins; Robin (Lauderhill, FL)|
|Filed:||November 26, 1976|
|Current U.S. Class:||379/101.01 ; 379/88.1; 379/88.24; 704/200; 704/201|
|Current International Class:||H04M 1/65 (20060101); H04M 11/08 (20060101); G06F 3/16 (20060101); H04M 011/00 ()|
|Field of Search:||179/2R,2A,2DP,1B,1FS,1P,15.55R,15.55T 340/172.5,347AD,15.5GC,15.5TS|